No Power In LCD Monitor Solved- Model: View Sonic VP720
A computer guy brought this to my shop and explained that it does not power up. While he was waiting in the shop, I powered it up myself and sure enough it was dead but I could see that the stand by light was on. I pushed the power button but there was no response.
It is an old machine. It dated back to November 2005 but even an old LCD computer monitor deserves a chance to be repaired. So, let the repair begins.
All these screws were taken off and the cover was lifted up. I exposed the main board and the power board. Take a look
I was expecting to see some bad capacitors but there was none. I have checked all the capacitors with my trusted ESR meter but all the capacitors were found in good working order.
Since there was a stand by light, that means the main board was sending the on and off single but for some reason, the LCD screen was not powering on.
All the powers to the main board were there and they were steady so my focus was on the main board.
The customer mentioned something about deserting the LCD computer monitor for a long time. It was sitting in this storage room for more than a year. I was looking for bad soldering joints and I found some but that did not solve the problem. I re heated the main board IC’s but that did not solve the problem either.
I almost gave up on this LCD computer monitor. So I let it sit on my repair table for a while. Took a break and I started working on something else.
I remembered in one of the LCD Monitor ebooks that MR Jestine Yong wrote if all voltages checked to be good and still no power then check the On/Off power switch. May be my case here is the same so I decided to check it out.
I was really shocked at myself because that did not cross my mind and it should have. I cannot explain it but it happened, after all I am still human. I used needle nose pliers to connect the two terminals of the power switch and I look what happened.
I replaced the main power switch and everything was restored perfectly. Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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